pH meter



FIG. 1 is a perspective view of a pH meter showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the pH meter and form no part of the claimed design. 

CLAIM The ornamental design for pH meter, as shown and described. 